A three-alarm explosion and fire at a Minneapolis home Sunday injured one resident and sent five firefighters to the hospital for heat exhaustion, a fire marshal said.

An explosion and fire started in a single-family home about 2:50 p.m. at 2321 Fillmore St. N.E., said Perry Ebner, Minneapolis fire marshal.

The extent of the resident’s injuries were not immediately known. The firefighters were treated and released from Hennepin County Medical Center, Ebner said.

A rear corner of the home blew out in the explosion, and the fire spread to the basement, main level and second floor. The cause of the explosion is under investigation, Ebner said.

A city block was evacuated as a precaution in case of a gas leak, which was not found, Ebner said. A neighboring home had singed vinyl siding.

A third alarm brought relief crews to the scene about an hour after it started, and the fire was under control at about 4:30 p.m., Ebner said.

— Andy Greder

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